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  <table class="tablesaw tablesaw-stack" data-tablesaw-mode="stack">
        <caption>Table 3: Summary of Evidence—Mammography Trials for Women Younger than 50 Years—Breast Cancer Mortality</caption>
        <thead>
            <tr>
                <th colspan="1" rowspan="2">Study</th>
                <th colspan="1" rowspan="2">Age at entry (years)</th>
                <th colspan="1" rowspan="2">Screening interval (months)</th>
                <th colspan="1" rowspan="2">Year study began</th>
                <th colspan="2" rowspan="1">Total study sample size</th>
                <th colspan="3" rowspan="1">Breast cancer mortality<sup><a class="footnote-ref" href="#fn-iii">iii</a></sup> at mid-range follow-up (6 to 8 years)</th>
                <th colspan="3" rowspan="1">Breast cancer mortality<sup><a class="footnote-ref" href="#fn-iii">iii</a></sup> at 14-year follow-up</th>
            </tr>
            <tr>
                <th>Study group</th>
                <th>Control group</th>
                <th>Study group</th>
                <th>Control group</th>
                <th>RR (95% CI)</th>
                <th>Study group</th>
                <th>Control group</th>
                <th>RR (95% CI)</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td>HIP<sup><a class="footnote-ref" href="#fn-66">66</a></sup></td>
                <td>40–49</td>
                <td>12</td>
                <td>1963</td>
                <td>13,740</td>
                <td>13,740</td>
                <td>19</td>
                <td>20</td>
                <td>0.95 (0.51–1.78)</td>
                <td>64</td>
                <td>82</td>
                <td>0.78 (0.56–1.08)</td>
            </tr>
            <tr>
                <td>Malmö<sup><a class="footnote-ref" href="#fn-58">58</a></sup></td>
                <td>45–54</td>
                <td>18–24</td>
                <td>1976</td>
                <td>13,568</td>
                <td>12,279</td>
                <td>N/A</td>
                <td>N/A</td>
                <td>N/A</td>
                <td>53</td>
                <td>66</td>
                <td>0.73 (0.51–1.04)</td>
            </tr>
            <tr>
                <td>Östergötland (E-County)<sup><a class="footnote-ref" href="#fn-65">65</a></sup></td>
                <td>40–49</td>
                <td>24</td>
                <td>1977</td>
                <td>10,285</td>
                <td>10,459</td>
                <td>15</td>
                <td>15</td>
                <td>1.03 (0.50–2.11)</td>
                <td>31</td>
                <td>30</td>
                <td>1.05 (0.64–1.73)</td>
            </tr>
            <tr>
                <td>Kopparberg (W-County)<sup><a class="footnote-ref" href="#fn-65">65</a></sup></td>
                <td>40–49</td>
                <td>24</td>
                <td>1977</td>
                <td>9,582</td>
                <td>5,031</td>
                <td>13</td>
                <td>9</td>
                <td>0.76 (0.32–1.77)</td>
                <td>22</td>
                <td>16</td>
                <td>0.72 (0.38–1.37)</td>
            </tr>
            <tr>
                <td>CNBSS-1<sup><a class="footnote-ref" href="#fn-56">56</a></sup></td>
                <td>40–49</td>
                <td>12</td>
                <td>1980</td>
                <td>25,214</td>
                <td>25,216</td>
                <td>38</td>
                <td>28</td>
                <td>1.36 (0.84–2.21)</td>
                <td>105</td>
                <td>108</td>
                <td>0.97 (0.74–1.27)</td>
            </tr>
            <tr>
                <td>Stockholm<sup><a class="footnote-ref" href="#fn-64">64</a></sup></td>
                <td>40–49</td>
                <td>28</td>
                <td>1981</td>
                <td>14,303</td>
                <td>8,021</td>
                <td>16</td>
                <td>8</td>
                <td>1.09 (0.40–3.00)</td>
                <td>34</td>
                <td>13</td>
                <td>1.47 (0.77–2.78)</td>
            </tr>
            <tr>
                <td>Göteborg<sup><a class="footnote-ref" href="#fn-63">63</a></sup></td>
                <td>39–49</td>
                <td>18</td>
                <td>1982</td>
                <td>11,724</td>
                <td>14,217</td>
                <td>16</td>
                <td>33</td>
                <td>0.59 (0.33–1.06)</td>
                <td>34</td>
                <td>59</td>
                <td>0.70 (0.46–1.06)</td>
            </tr>
            <tr>
                <td>UK AGE<sup><a class="footnote-ref" href="#fn-61">61</a></sup></td>
                <td>39–41</td>
                <td>12</td>
                <td>1991</td>
                <td>53,884</td>
                <td>106,956</td>
                <td>26</td>
                <td>65</td>
                <td>0.79 (0.48–1.27)</td>
                <td>105</td>
                <td>251</td>
                <td>0.83 (0.66–1.04)</td>
            </tr>
        </tbody>
    </table>
  
  
  
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